Abstract
Developing the triethylamine sensor with excellent sensitivity and selectivity is important for detecting the triethylamine concentration change in the environment. In this work, flower-like CeO2-SnO2 composites with different contents of CeO2 were successfully synthesized by the one-step hydrothermal reaction. Some characterization methods were used to research the morphology and structure of the samples. Gas-sensing performance of the CeO2-SnO2 gas sensor was also studied and the results show that the flower-like CeO2-SnO2 composite showed an enhanced gas-sensing property to triethylamine compared to that of pure SnO2. The response value of the 5 wt.% CeO2 content composite based sensor to 200 ppm triethylamine under the optimum working temperature (310 °C) is approximately 3.8 times higher than pure SnO2. In addition, CeO2-SnO2 composite is also significantly more selective for triethylamine than pure SnO2 and has better linearity over a wide range of triethylamine concentrations. The improved gas-sensing mechanism of the composites toward triethylamine was also carefully discussed.
Highlights
Triethylamine (TEA) is a colorless, transparent oily liquid with strong ammonia odor and was widely used as an organic solvent, raw material, polymerization inhibitor, preservative, catalyst and synthetic dye [1,2]
The experimental results indicate that the TEA gas sensing performance of the CeO2-SnO2 composites based sensors are significantly improved by the modification of a small amount of CeO2 compared with pure SnO2, especially in terms of sensitivity and selectivity
In a typical process of synthesize CeO2-SnO2 composites, 3.6 g NSnanComl2a·t2erHia2lsO20a1n8,d8,1x1F.7O6RgPENERa3RCE6VHIE5WO7·2H2O were dissolved into 40 mL of distilled water with st8irorifn1g1
Summary
Triethylamine (TEA) is a colorless, transparent oily liquid with strong ammonia odor and was widely used as an organic solvent, raw material, polymerization inhibitor, preservative, catalyst and synthetic dye [1,2]. We know that the traditional SnO2 based gas sensors has some obvious problems of low gas response, high optimum working temperature, poor selectivity and stability [25,26,27]. Researchers use another MOS doped SnO2 to improve its gas sensitivity. The experimental results indicate that the TEA gas sensing performance of the CeO2-SnO2 composites based sensors are significantly improved by the modification of a small amount of CeO2 compared with pure SnO2, especially in terms of sensitivity and selectivity.
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